bors 6d9ee9e5eb Auto merge of #4372 - phansch:changelog_update, r=flip1995
docs: Explain how to update the changelog

cc @Manishearth Is this more or less how you did it last time?

[Rendered](https://github.com/phansch/rust-clippy/blob/changelog_update/doc/changelog_update.md#changelog-update)

changelog: none
2019-08-21 08:46:10 +00:00
..
2019-08-20 09:59:13 +07:00